1. Generate FM signal with 300-400MHz bandwidth between 500MHz and 6GHz carrier frequency.
are you trying to build a cell phone "blanker" ?!?
1. Using Software Defined Radios (SDR) - SDRs do not provide large bandwidths as per my requirement
2. Using Analog Front End ICs, such as AFE7900 from Texas. This looks expensive solution and tedious
Any other solutions to think of?
A hardware that can do phone jammer might work for me but phone jammers do not require a large bandwidth like I do.
Cellular network operators do have the personnel and resources to find people jamming their networks - I worked with them for years - but most of the time this jamming is unintentional
if I understand correctly, for 5G it will be more easy than for 2G/3G/4G, because they using phased antenna array to rotate beam, so it will works like radar and allows to get more precise position of transmitter with triangulation, isn't it?
Just wonder is it possible to use some kind of synchronized array of transmitters distributed all around the base stations and transmitted signals in that way so their interference signal at base station location gives false position of the transmitter or just spamming it with a bunch of virtual transmitter positions to make it hard to find which one is real? Are such kind of jammers are used in practice?
Check out the DARPA program Computational Leverage Against Surveillance Systems or CLASS.
https://www.darpa.mil/program/computational-leverage-against-surveillance-systems
We developed the computational chip over a decade ago for CLASS.
It is all about I want to create interference and come up with resilient communication solution for space-terrestrial based broadband communication. This involves a tiny band of frequencies over 400MHz bandwidth.
Check out the DARPA program Computational Leverage Against Surveillance Systems or CLASS.
https://www.darpa.mil/program/computational-leverage-against-surveillance-systems
We developed the computational chip over a decade ago for CLASS.
is there any public available detailed info about used approaches in this program?
Check out the DARPA program Computational Leverage Against Surveillance Systems or CLASS.
For example, imagine a large number of smart-phones moving around a large campus area and being elements in a vast synthetic aperture phased array able to dynamically beam form in real time while all the elements are moving around randomly!! You can imagine the enormous computational power required for this to work, yet all was condensed into a single ~1 Billion Device chip over a decade ago!!!
Check out the DARPA program Computational Leverage Against Surveillance Systems or CLASS.
Interesting that (to me) at least some of this seems like "security through obfuscation."
1) Waveform Complexity uses advanced communications waveforms that are difficult to recover without knowledge and understanding of the signals itself; 2) Spatial Diversity uses distributed communications devices and the communication environment to disguise and dynamically vary the apparent location of the signal; 3) Interference Exploitation makes use of the clutter in the signal environment to make it difficult for an adversary to isolate a particular signal.
As for "dynamically varying the apparent location of the signal" - I'm not sure what that's supposed to mean. The apparent location? I'm guessing they mean having multiple, geographically distributed nodes all transmitting simultaneously on the same frequency, but there are also ways of DF'ing those kinds of signals as well.
https://www.rohde-schwarz.com/us/applications/super-resolution-df-method-application-card_56279-199552.html
For example, imagine a large number of smart-phones moving around a large campus area and being elements in a vast synthetic aperture phased array able to dynamically beam form in real time while all the elements are moving around randomly!! You can imagine the enormous computational power required for this to work, yet all was condensed into a single ~1 Billion Device chip over a decade ago!!!
And how are the nodes (a) precisely time and phase synchronized and (b) controlled ?
I understand the theoretical part of this, but fail to see how it could practically be implemented on a large (kilometers) geographical scale.
Incidentally, "triangulation" as a DF or interference-hunting methodology is, in my experience, both very overrated and very misunderstood. Unless you are in a more or less reflection (multipath) free environment, it's very difficult to get good bearings: calculating the interception of those bearings is trivial, but junk bearings yield junk results.
Since interference / jamming happens around (or at least is important around) people, this means most practical DF'ing is being done in urban and suburban environments where multipath can be an issue.
For cellular network operators, they know from the base station stats (RSSI, e.g.) which sector or sectors are being affected, and in most cases you can simply drive (or walk) the sector until you get close and have to hunt on foot (where triangulation is completely useless).
Just wonder is it possible to use some kind of synchronized array of transmitters distributed all around the base stations and transmitted signals in that way so their interference signal at base station location gives false position of the transmitter or just spamming it with a bunch of virtual transmitter positions to make it hard to find which one is real? Are such kind of jammers are used in practice?
There are a lot of "creative" approaches to jamming, but high-end direction finding systems (like the ones we make) can usually still DF people trying to use "creative" techniques. Generally speaking, for a jammer to be effective it has to be (a) loud, (b) wide, and (c) on, and all three of those things make jammers relatively easy to DF, regardless of how they are implemented. A weak signal with a low duty cycle that's only a few kHz wide is harder to DF, but it's also not an effective jammer.